Steam-boiler



HMT. MITCHELL. STAM BoILER.

Patented Jan. 19, 1886.

v (No Model.)

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1 embodying my invention.

UNITED STATES EEICE.

PATENT STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 334,673, dated January 19,1886.

Application filed J une ll, 1855. Serial No. 16".208. (No model.)

To all whom it may concern Beit known that I, HARVEY J. MITCHELL, a citizen of the United States, residing at Hatborough, in the county of Montgomery, State of Pennsylvania, have invented a new and useful Improvement in Steam-Boilers, which improvement is fully set forth in the following specification and accompanying drawings, in which- Figure l represents a partial side elevation and partial vertical section of a steam-boiler Fig. 2 represents a partial top orvplan View and a partial horizontal section in line a; x, Fig. 1.

Fig. 3 represents a top or plan view of one of the watercolumns thereof. Fig. 4 represents a section thereof in line y y., Fig. 5 represents a side elevation of one of the coils of the boiler.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists of a steam-boiler provided with coils whose joints and connections with the water-column are outside pi", the furnace, thus avoiding leakage in the latter, and retnldering the connections conveniently access1 e.

It also consists of the construction of the coils, whereby steam is rapidly formed.

It further consists of water-columns formed of sections or annuli, as will be hereinafter fully set forth. Y

Referringto the drawings, A represents-a furnace, which is of usual construction, andA B represents coils, which are nested within said furnace, the opposite ends of each coil passing through the side of the furnace, so that the terminations are outside of the same.

O represents water-columns, which rise from a hollow base, D, and are in communication therewith, and the ends of the coils are connected with said columns, thus oecasioning a circulation of Water through the columns, coils, and base, and affording an easy means of cleaning out sediment. The columns C are formedof sections or annnli E, imposed. one on the other, the contiguous facer angular, thus forming rabbeted joints, as at E', and preventing the lateral displacement of the annuli. The annuli are held together by bolts F, which are passed through the top caps, G, of the columns and flanges H on the base D, and tightened by nuts J, whereby the annuli are firmly clamped one to another as one. The joints of the annuli may be ground or packed, as desired, for preventing leakage.

It will be seen that the columns "may be readily built up of any desired height or diameter, and should either annuli require removal it may be readily accomplished by unscrewing the nuts J. Each coil B is continuous, so that it has no joint within the furnace, and its ends are outsidev of the same, whereby leakage within the furnace is prevented, and said ends are accessible in the space between the furnace and water-columns, whereby, should either coil give out, it may be disconnected from the waterlcolumns and the opening in the latter properly plugged,^whereby the boiler may render service without said coil, the latter, however, being removable whenever required.

The convolutions of the coils increase from the bottom upward, and the cold water first enters the narrow convolutions, which receive the greatest amount of heat from the furnace, and then flows successively through the larger convolutions, so as to permit the expansion of the steam formed therein, and as all of the convolntions of the nested coils are exposed to the products of combustion, it is evident that steam is rapidly produced. The steam is directed from the top of the columns to the place of service by pipes in any suitable inanner.

The deiiector K at the top of the furnace prevents direct escape of the products of conibustion to the flue thereof.

The sections or annuli E may be made of iron, steel, or other suitable metal.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination of the sectional watercolumns C, nest of coils B, and defieetor K, substantially as described.

2. The combination of the sectional Watercolumns C, nest of coils B, having their convolutions increasing in width from the bottom upward, and having inlets in the said columns, one above the other, substantially as shown.

3. In a steain-boiler, a water-column composed of annuli having angular contiguous faces, thereby forming rabbet-joints, the said unnuli being secured in position by bolts puss- 5. A furnace huvinga \\'ute1colun1n formed ing through flanges on the outer one thereof,l in sections, a Water-base, and bolts or screws substantiallyas described. connected with the cap of said column, and

4. A furnace with u coil incloscd therein, a ears or flanges on said base, substantially as 5 water column or columns outside of said furdescribed.

nace, and a watcivbase, the ends of the coil .Y 1 y f passing through the side of the furnace and NARN 1A J' MIFCHELL' connected with the column, the coil, column, lVitnesseS:

and base being in communication, subscan- Trios. PIERGEY,

1c tially as described. l B. F. HART. 

